/*!
**	 CairoColor class implementation
**
**	Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
**	Copyright (c) 2007, 2008 Chris Moore
**	Copyright (c) 2012-2013 Carlos López
**	Copyright (c) 2015 Diego Barrios Romero
**
**	This package is free software; you can redistribute it and/or
**	modify it under the terms of the GNU General Public License as
**	published by the Free Software Foundation; either version 2 of
**	the License, or (at your option) any later version.
**
**	This package is distributed in the hope that it will be useful,
**	but WITHOUT ANY WARRANTY; without even the implied warranty of
**	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
**	General Public License for more details.
**
*/

#ifdef USING_PCH
#	include "pch.h"
#else
#ifdef HAVE_CONFIG_H
#	include <config.h>
#endif

#include <ETL/angle>
#include "color.h"
#include "cairocolor.h"
#include <cstdio>
#include <sstream>
#include <iostream>
#include <iomanip>
#include "cairocolorblendingfunctions.h"

#endif

namespace synfig
{

const float CairoColor::range = CairoColor::ceil - CairoColor::floor;

unsigned char
CairoColor::hex2char(String s)
{
    ColorReal cr(Color::hex2real(s));
    return (unsigned char)(cr * 255.0f);
}

const String
CairoColor::char2hex(unsigned char c)
{
    String s(Color::real2hex((ColorReal)(c / ((float)ceil))));
    return s.c_str();
}

void
CairoColor::set_hex(String& str)
{
    CairoColor ret(*this);
    Color c;
    c.set_hex(str);
    c = c.clamped();
    ret = CairoColor(c);
}

const String
CairoColor::get_string(void)const
{
    std::ostringstream o;
    o << std::fixed << std::setprecision(3) << "#" << get_hex().c_str() << " : " << std::setw(6) << get_a();
    return String(o.str().c_str());
}

CairoColor
CairoColor::blend(CairoColor a, CairoColor b, float amount, Color::BlendMethod type)
{
    // No matter what blend method is being used,
    // if the amount is equal to zero, then only B
    // will shine through
    if (fabsf(amount) <= COLOR_EPSILON) {
        return b;
    }

    assert(type < Color::BLEND_END);

    const static cairoblendfunc vtable[Color::BLEND_END] = {
        // WARNING: any change here must be coordinated with
        // other specializations of the functions.
        blendfunc_COMPOSITE<CairoColor>,			blendfunc_STRAIGHT<CairoColor>,
        blendfunc_BRIGHTEN<CairoColor>,
        blendfunc_DARKEN<CairoColor>,
        blendfunc_ADD<CairoColor>,
        blendfunc_SUBTRACT<CairoColor>,				blendfunc_MULTIPLY<CairoColor>,
        blendfunc_DIVIDE<CairoColor>,
        blendfunc_COLOR<CairoColor>,
        blendfunc_HUE<CairoColor>,
        blendfunc_SATURATION<CairoColor>,			blendfunc_LUMINANCE<CairoColor>,
        blendfunc_BEHIND<CairoColor>,
        blendfunc_ONTO<CairoColor>,
        blendfunc_ALPHA_BRIGHTEN<CairoColor>,
        blendfunc_ALPHA_DARKEN<CairoColor>,			blendfunc_SCREEN<CairoColor>,
        blendfunc_HARD_LIGHT<CairoColor>,
        blendfunc_DIFFERENCE<CairoColor>,
        blendfunc_ALPHA_OVER<CairoColor>,
        blendfunc_OVERLAY<CairoColor>,				blendfunc_STRAIGHT_ONTO<CairoColor>,
    };

    return vtable[type](a, b, amount);
}

} // synfig namespace